1. The physical state of human papillomavirus 16 DNA in cervical carcinoma and cervical intraepithelial neoplasia
- Author
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Fukushima, M., Yamakawa, Y., Shimano, S., Hashimoto, M., Sawada, Y., and Fujinaga, K.
- Subjects
Papillomavirus infections -- Complications ,Papillomaviruses ,Cervical cancer -- Causes of ,Health - Abstract
Genital warts, also known as condyloma acuminata, are caused by the human papillomavirus (HPV). Rare cases have been reported in which genital warts have developed into cancerous tumors. Research has revealed more than 60 types of HPV. While HPV 6 is most often associated with genital warts, it is not found in cervical cancer. Types 16 and 18 are commonly detected in cervical cancer; other types such as 31, 33, 35, and 52b have been detected less frequently. Since HPV types 16 and 18 have been shown to be involved in causing the continuous growth of cells in tissue culture, it is believed that these viruses may play a causative role in the development of cancer of the cervix. It has been assumed that the viral DNA becomes integrated into the host genome as a part of the disease process of both warts and cancer, but little evidence to support this theory has been obtained directly from specimens of human cervical cancer. For this reason, cervical biopsy specimens were examined for the presence of human papillomavirus DNA, and to determine if the DNA is integrated into the host genome or is present in the episomal state, that is, present as unintegrated viral genome. HPV DNA was found in 62 percent of the cervical cancers, in keeping with previous reports. Many researchers suspect that the incidence would approach 100 percent if detection methods were more sensitive. Also in keeping with previous reports, HPV 16 was the most commonly identified type, with HPV 18 also frequently observed. Ten cancer specimens positive for HPV 16 DNA were analyzed for the physical state of the genes. In four specimens, both integrated DNA and viral DNA were present. In one specimen, only viral DNA could be found. Although it is impossible to rule out cancer resulting from some other cause in this specimen, the findings suggest that integration of the viral DNA into the host genome may not be necessary for the cancerous transformation of cells by HPV. (Consumer Summary produced by Reliance Medical Information, Inc.)
- Published
- 1990